To add your phone number to your Twitter account from the web:

Enter your phone number. No need to include your country code or leading zero; we handle these automatically. Click Continue.

We will send an SMS text message to your phone number. Enter the code contained in that message and click Continue.

Your phone should now be added to your Twitter account.

To add or remove your phone number to your account via Twitter for iPhone:

How to add your phone number:

On your profile, tap the gear icon and select Settings.

Tap the account you’d like to add a phone number to.

Scroll down to Phone Number. If you haven’t previously added a phone number, tap Add. (Note: if you have already added a phone number, tapping this button will give you an option to remove this number and add a new one.)

Enter your phone number in the empty field and tap Add phone.

Twitter will then send an SMS text message with a verification code to the phone number you added. Enter the verification code and tap Verify.

How to remove your phone number:

On your profile, tap the gear icon and select Settings.

Tap the account you’d like to remove a phone number from.

Scroll down to Phone Number and tap it to receive an option to remove this number.

When you see the prompt asking Do you want to remove the number?, select OK and add your password to confirm.

To add or remove your phone number to your account via Twitter for Android:

How to add your phone number:

Tap the overflow icon and select Settings.

Tap the account you’d like to add a phone number to.

Scroll down to Phone Number. If you haven’t previously added a phone number, tap Add. (Note: if you have already added a phone number, tapping this button will give you an option to remove this number and add a new one.)

Enter your phone number in the empty field and tap Add phone.

Twitter will then send an SMS text message confirming your phone number has been added.

How to remove your phone number:

Tap the overflow icon and select Settings.

Tap the account you’d like to remove a phone number from.

Scroll down to Phone Number and tap it to receive an option to remove this number.

When you see the prompt asking Do you want to remove the number?, select OK and add your password to confirm.

If you are located outside of the US, you may need to follow these extra steps:

You will be asked to Choose your carrier after you've entered your phone number.

You may need to select the desired language you'd like to send and receive Tweets in.

To add your phone to your Twitter account via text message to a short code:

Note: If your mobile operator is one of our supported carriers, you can use a short code with your Twitter account to post Tweets, receive notifications and enroll in security features like login verification. Here’s how:

Text your username to the same number. Do not use the @ symbol or quotation marks. Send your username ONLY, for example: larrybird

Next, text your password. This is case sensitive, so be sure you are sending your password correctly.

You're ready to go! Now you can post Tweets, receive notifications about your account, and enroll in security features like login verification.

To add your phone to your Twitter account via text message to a long code:

Note: If your country and carrier are not listed as having a short code, it may be possible for you to post a Tweet using any of our Twitter long codes.

If you have to use a long code, note that it is one-way only. You will not be able to receive Tweets or other Twitter notifications to your phone through this channel, and you may be charged international message rates when using these codes. For these reasons, we do not recommend features such as login verification for long code users, as the experience may be less than optimal.

Begin by sending two separate text messages to the long code with the word STOP.

Wait two to three minutes before proceeding.

Send a text message to the long code with the word START.

Wait two to three minutes before proceeding.

Text YES to the Twitter long code.

Wait two to three minutes before proceeding.

Text your username to the same number. Do not use the @ symbol or quotation marks. Send your username ONLY, for example: larrybird

Wait two to three minutes before proceeding.

Text your password. This is case sensitive, so be sure you are sending your password correctly.

You’re ready to go!

Note: Make sure to wait a few minutes between each step to make sure Twitter is receiving your messages correctly.

To test if you have correctly added your phone, send a test Tweet to your long code number (just like sending a normal text message). Then, log in to www.twitter.com via the web to make sure your Tweet shows up on your Twitter profile. If it does, you have correctly added your phone. Once again, you will not be able to receive any texts back from a long code.